<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>2.14</title>
</head>

<body>
    <script>
        let str1 = 'x'.padStart(5, 'ab');
            console.log(str1);  //ababx

            let str2 = 'x'.padStart(4, 'ab');
            console.log(str2);  //'abax'

            let str3 = 'x'.padEnd(5, 'ab');
            console.log(str3);  //'xabab'

            let str4 = 'x'.padEnd(4, 'ab');
            console.log(str4);  //'xaba'
    </script>
</body>

</html>